Methods for the measurement of volume flow of gas of water-ring vacuum pumps and compressors
1 Scope
This standard specifies the devices, methods and requirements for measuring the volume flow of gas during factory tests of water-ring vacuum pumps and compressors (collectively referred to as water-ring pumps without distinction).
This standard is applicable to the measurement of volume flow of gas of water-ring pumps with orifice plates and metering nozzles, but metering nozzles are only applicable to the measurement of volume flow of gas of water-ring vacuum pumps.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard, however parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 2624.1-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 1: General principles and requirements (ISO 5167-1: 2003, IDT)
GB/T 2624.2-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 2: Orifice plates (ISO 5167-2: 2003, IDT)
GB/T 2624.3-2006 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Part 3: Nozzles and Venturi nozzles (ISO 5167-3: 2003, IDT)
GB/T 3163 Vacuum technology - Terminology
GB/T 13929 Methods of testing for water-ring vacuum pumps and compressors
JB/T 7255 Water ring vacuum pumps and compressors
3 Terms and definitions
For the purposes of this standard, the terms and definitions specified in GB/T 3163, GB/T 13929 and JB/T 7255 apply.
4 Measurement methods
4.1 General requirements
4.1.1 Conditions for measuring the volume flow of gas: the ambient conditions (natural environment not under human control such as pressure, temperature and humidity) during measurement, and the appropriate temperature of air medium to be 0℃~35℃.
4.1.2 Stated intake conditions: atmospheric pressure to be 1,013.25hPa, gas temperature 20℃, and relative humidity of gas 70%.
4.1.3 When the conditions for measuring the volume flow of gas do not conform to the stated gas intake conditions, the results under the measurement conditions can be converted into the volume flow of gas under the stated intake conditions.
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement methods
5 Calculation and determination of volume flow
6 Calculation and determination of volume flow of gas of water-ring vacuum pumps and compressors
Annex A (Normative) Method of measurement using metering nozzles
Annex B (Informative) Method for the measurement of volume flow of saturated gas
